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Proceedings Paper

Post Filtering for Cell Loss Concealment in Packet Video
Author(s): Kou-Hu Tzou
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Paper Abstract

A packet network provides an effective way of multiplexing variable-rate sources, such as video and voice, by taking into account the source statistics. However, network congestion will result in packet (cell) losses which may substantially degrade video quality. In this paper, we investigate the effects of cell losses on a Lapped Orthogonal Transform (LOT) coding system and methods to restore the degraded image. Due to the overlapping nature of the LOT, an image block can be partially reconstructed if the corresponding coefficient block is missing. The degraded image block is modeled as a blurred original block corrupted by a correlated noise. A minimum mean-squared-error restoration filter is designed using a first-order Markov model for the image. The restored image shows noticeable quality improvement.

Paper Details

Date Published: 1 November 1989
PDF: 10 pages
Proc. SPIE 1199, Visual Communications and Image Processing IV, (1 November 1989); doi: 10.1117/12.970172
Show Author Affiliations
Kou-Hu Tzou, Bellcore (United States)


Published in SPIE Proceedings Vol. 1199:
Visual Communications and Image Processing IV
William A. Pearlman, Editor(s)

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